Ball, W. W. Rouse (Walter William Rouse), 1850-1925 · London, Macmillan · leaf 122
sail is less than thepressure of the wind behind the sail and normal to it, theresultant of the two will be a force behind the sail and normalto it which tends to drive the boat forwards. But as thevelocity of the boat increases, a time will arrive when thepressure of the wind is only just able to… … In the accompanying figure, let BAR represent the keelof a boat, B being the bow, and let SAL represent the sail.Suppose that the wind is blowing in the direction WA witha velocity u; and that this direction makes an angle d withthe keel, i.e. angle WAR = 6. Suppose that the sail is set soas to…
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